﻿using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace SourceGit.Commands {
    public class QueryLocalChanges : Command {
        private static readonly Regex REG_FORMAT = new Regex(@"^(\s?[\w\?]{1,4})\s+(.+)$");
        private static readonly string[] UNTRACKED = [ "no", "all" ];

        public QueryLocalChanges(string repo, bool includeUntracked = true) {
            WorkingDirectory = repo;
            Context = repo;
            Args = $"status -u{UNTRACKED[includeUntracked ? 1 : 0]} --ignore-submodules=dirty --porcelain";
        }

        public List<Models.Change> Result() {
            Exec();
            return _changes;
        }

        protected override void OnReadline(string line) {
            var match = REG_FORMAT.Match(line);
            if (!match.Success) return;
            if (line.EndsWith("/", StringComparison.Ordinal)) return; // Ignore changes with git-worktree

            var change = new Models.Change() { Path = match.Groups[2].Value };
            var status = match.Groups[1].Value;

            switch (status) {
            case " M": change.Set(Models.ChangeState.None, Models.ChangeState.Modified); break;
            case " A": change.Set(Models.ChangeState.None, Models.ChangeState.Added); break;
            case " D": change.Set(Models.ChangeState.None, Models.ChangeState.Deleted); break;
            case " R": change.Set(Models.ChangeState.None, Models.ChangeState.Renamed); break;
            case " C": change.Set(Models.ChangeState.None, Models.ChangeState.Copied); break;
            case "M": change.Set(Models.ChangeState.Modified, Models.ChangeState.None); break;
            case "MM": change.Set(Models.ChangeState.Modified, Models.ChangeState.Modified); break;
            case "MD": change.Set(Models.ChangeState.Modified, Models.ChangeState.Deleted); break;
            case "A": change.Set(Models.ChangeState.Added, Models.ChangeState.None); break;
            case "AM": change.Set(Models.ChangeState.Added, Models.ChangeState.Modified); break;
            case "AD": change.Set(Models.ChangeState.Added, Models.ChangeState.Deleted); break;
            case "D": change.Set(Models.ChangeState.Deleted, Models.ChangeState.None); break;
            case "R": change.Set(Models.ChangeState.Renamed, Models.ChangeState.None); break;
            case "RM": change.Set(Models.ChangeState.Renamed, Models.ChangeState.Modified); break;
            case "RD": change.Set(Models.ChangeState.Renamed, Models.ChangeState.Deleted); break;
            case "C": change.Set(Models.ChangeState.Copied, Models.ChangeState.None); break;
            case "CM": change.Set(Models.ChangeState.Copied, Models.ChangeState.Modified); break;
            case "CD": change.Set(Models.ChangeState.Copied, Models.ChangeState.Deleted); break;
            case "DR": change.Set(Models.ChangeState.Deleted, Models.ChangeState.Renamed); break;
            case "DC": change.Set(Models.ChangeState.Deleted, Models.ChangeState.Copied); break;
            case "DD": change.Set(Models.ChangeState.Deleted, Models.ChangeState.Deleted); break;
            case "AU": change.Set(Models.ChangeState.Added, Models.ChangeState.Unmerged); break;
            case "UD": change.Set(Models.ChangeState.Unmerged, Models.ChangeState.Deleted); break;
            case "UA": change.Set(Models.ChangeState.Unmerged, Models.ChangeState.Added); break;
            case "DU": change.Set(Models.ChangeState.Deleted, Models.ChangeState.Unmerged); break;
            case "AA": change.Set(Models.ChangeState.Added, Models.ChangeState.Added); break;
            case "UU": change.Set(Models.ChangeState.Unmerged, Models.ChangeState.Unmerged); break;
            case "??": change.Set(Models.ChangeState.Untracked, Models.ChangeState.Untracked); break;
            default: return;
            }

            _changes.Add(change);
        }

        private List<Models.Change> _changes = new List<Models.Change>();
    }
}
